<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box{
            width: 80%;
            background-color: pink;
            margin: 100px auto;
            height: 60px;
            display: flex;
        }
        .item{
            background-color: skyblue;
            flex: 1;
            height: 60px;
        }
        .box .three{
            flex: 2;
        }
    </style>
</head>
<body>
    <div class="box">
        <div class="item">1</div>
        <div class="item">2</div>
        <div class="item three">3</div>
        <div class="item">4</div>
        <div class="item">5</div>
    </div>
</body>
</html>